CIGWELD transarc 300 Si Manuel de service télécharger pdf (Page 42)

TRANSARC 300 Si SERVICE MANUAL

January 15, 2008

10-4

5. Non-metallic particles are

trapped in the weld metal

(slag inclusion).

A. Non-metallic particles may be trapped

in undercut from previous run.

A. If bad undercut is present, clean

slag out and cover with a run from a

smaller diameter electrode.

B. Joint preparation too restricted. B. Allow for adequate penetration and

room for cleaning out the slag.

C. Irregular deposits allow slag to be

trapped.

C. If very bad, chip or grind out

irregularities.

D. Lack of penetration with slag trapped

beneath weld bead.

D. Use smaller electrode with sufﬁcient

current to give adequate penetration.

Use suitable tools to remove all slag

from corners.

E. Rust or mill scale is preventing full

fusion.

E. Clean joint before welding.

F. Wrong electrode for position in which

welding is done.

F. Use electrodes designed for position

in which welding is done, otherwise

proper control of slag is difﬁcult.

Figure 10 – Examples of slag inclusion

10.03 Power Source Problems

Description Possible Cause Remedy

1. The welding arc cannot be

established

A .

The Primary supply voltage has not

been switched ON.

The Welding Power Source switch

is switched OFF.

A .

Switch ON the Primary supply

voltage.

Switch ON the Welding Power

Source.

C. Loose connections internally. C. Have an Accredited Cigweld

Service Provider repair the

connection.

2. Maximum output welding

current can not be achieved

with nominal Mains supply

voltage.

Defective control circuit Have an Accredited Cigweld

Service Provider inspect then

repair the welder.

3. Welding current reduces when

welding

Poor work lead connection to the

work piece.

Ensure that the work lead has a

positive electrical connection to

the work piece.

4. No gas flow when the torch

trigger switch is depressed.

Gas hose is cut.

Gas passage contains impurities.

Replace gas hose.

Disconnect gas hose from the

rear of Power Source then raise

gas pressure and blow out

impurities.

C. Gas regulator turned off. C. Turn gas regulator on.

D. Torch trigger switch lead is

disconnected or switch/cable is

faulty.

D. Reconnect lead or repair faulty

switch/cable.

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CIGWELD transarc 300 Si Manuel de service Page 42

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